Bug occurence 1

There is a message (#91404 (comment)) from a non-core contributor with authorship inconsistence. It's properly attributed to a GitHub user but a big message avatar image is taken from a mannequin.

However, another after-migration message from the same user (#89702 (comment)) has no such an issue.

A screenshot of #91404:

Bug occurence 2

A notification on referring from another issue/PR (#91230 (reference)) is fully attributed to a mannequin:

while the referrer isn't and can't because it's a PR:

Bug occurence 3

#89279 (comment), the same as occurence 1.